Very useful site for declinsion and conjugation is the Russian Dictionary Tree by Cornell Uni.

http://russian.dmll.cornell.edu/rdt/

Type in anything in any case and it will give you the nominative / infinitive plus all declinsions / conjugations for whichever word your searching. You also get some good examples sometimes to help in understanding the differences with prepositions, for example.

BTW, you need to be using a Cyrillic Windows-1251 character encoding for it to work, or else it won't find anything for you.